Abstract
This study has assessed the reef community characteristics so as to describe the community change following a severe threat and adaptively manage coral reefs in response to the 2016 and future bleaching events. The study was conducted in Misali, Bawe, Chumbe, and Mnemba reefs in Zanzibar. Misali reef is located in Pemba Island, whereas the remaining three reefs are located in Unguja Island. The composition of the benthic cover within plots was assessed using the 20-m-long line intercept method. Each site had two plots at least 150 m apart. Four transects were randomly placed within each plot. A total of 63 benthic categories, summarized into 8 major groups, hard corals (49 categories), soft corals, sponges, algae (5 categories), corallimorpharians, hard substrates (4 categories), soft substrate, and others, were monitored. Hard corals were assessed at genus level to improve biodiversity change detection. Coral bleaching levels and coral size class distribution were assessed. A belt transect of 25 m × 1 m was used to sample for coral colonies larger than 10 cm in diameter, whereas sampling for corals smaller than 10 cm, which were considered as recruits, was done using six 1 m2 quadrats located along the transect, at fixed intervals of 0, 5, 10, 15, 20, and 25 m. Four transects per plot were sampled out. The results showed that prevalence of bleaching among surveyed reefs varied between 74% (Misali) and 88% (Bawe). However, the effect of bleaching to coral cover loss was more pronounced in Bawe (37%) and Chumbe reef (19%). Genus Acropora was the most affected coral with higher relative proportions of dead colonies for Misali (85%), Chumbe (63%), and Mnemba (43%) and Porites for Bawe (39%). Genus Porites at Bawe and Acropora at Misali and Mnemba have temporarily lost their dominance to Echinopora, Galaxea, and Porites, respectively. Coral diversity was highest in Misali for both adult and recruit populations and was lowest in Bawe reef. Geographical location, coral community composition, diversity, and reef topography are suggested to be among the determinants of variability in coral bleaching prevalence and impact to coral cover loss.
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References
Coles SL (1988) Limitations on reef coral development in the Arabian Gulf: Temperature or algal competition? Proceedings of the 6th International Coral Reef Symposium 3:211–216
Donner SD, William JS, Rvingw KI et al (2005) Global assessment of coral bleaching and required rates of adaptation under climate change. Glob Chang Biol 11:2251–2265
English S, Wilkinson C, Baker V (1994) Survey manual for tropical marine resources, 2nd edn. Australian Institute of Marine Science, Townsville, 368 pp
Garrett C (1996) Processes in the surface mixed layer of the ocean. Dyn Atmos Oceans 23:19–34
Hoegh-Guldberg O (1999) Climate change, coral bleaching and the future of the world’s coral reefs. Mar Freshw Res 50:839–866
Hoegh-Guldberg O, Mumby PJ, Hooten AJ et al (2007) Coral reefs under rapid climate change and ocean acidification. Science 318:1737–1742
Lange G, Jiddawi N (2009) Economic value of marine ecosystem services in Zanzibar: Implications for marine conservation and sustainable development. Ocean Coast Manag 52:521–532
Loya Y, Sakai K, Yamazato K et al (2001) Coral bleaching: the winners and losers. Ecol Lett 4:122–131
McClanahan TR, Ateweberhan M, Muhando CA et al (2007a) Effects of climate and seawater temperature variation on coral bleaching and mortality. Ecol Monogr 77(4):503–525
McClanahan TRM, Ateweberhan C, Ruiz Sebastia´n NAJ et al (2007b) Western Indian Ocean coral communities: bleaching responses, and susceptibility to extinction. Mar Ecol Prog Ser 337:1–13
Mohammed MS (2016) Distribution and abundance of diseases on reef corals in Tanzania. Dissertation. University of Dar es Salaam, 201 pp
Moum JN, Smyth WD (2001) Upper ocean mixing processes. Encyclopedia of Ocean Sciences 6:3093–3100
Muhando CA (2003) Enhanced coral larval settlement and coral transplantation as means of promoting coral replenishment in Tanzania. Dissertation. University of Dar es Salaam, 285 pp
Muhando CA (2008) Approaches to coral reef monitoring in Tanzania. In: Obura DO, Tamelander J, Linden O (eds) Ten years after bleaching e facing the consequences of climate change in the Indian Ocean.CORDIO Status Report 2008. Coastal Oceans Research and Development in the Indian Ocean/Sida-SAREC, Mombasa, pp 129–138 http://www.cordioea.org.
Muzuka AN, Dubi AM, Muhando CA et al (2010) Impact of hydrographic parameters and seasonal variation in sediment fluxes on coral status at Chumbe and Bawe reefs, Zanzibar, Tanzania. Estuar Coast Shelf Sci 30:1–8
Obura DO, Grimsdith G (2009) Resilience assessment of coral reefs – Assessment protocol for coral reefs, focusing on coral bleaching and thermal stress. IUCN working group on Climate Change and Coral Reefs. IUCN, Gland, 70 p
Pastorok RA, Bilyard GR (1985) Effects of sewage pollution and coral reefs communities. Mar Ecol Prog Ser 21:175–189
Pausas JG, Austin MP (2001) Patterns of plant species richness in relation to different environments: an appraisal. J Vegetation Sci 12(2):153–166
Sale PF (ed) (2013) The ecology of fishes on coral reefs. Elsevier
Schläpfer F, Schmid B (1999) Ecosystem effects of biodiversity: a classification of hypotheses and exploration of empirical results. Ecol Appl 9(3):893–912
Thorpe SA (1995) Dynamical processes at the sea surface. Prog Oceanogr 35:315–352
Ussi AM (2014) Recruitment and growth of scleractinian corals in relation to bio-physical processes in reefs of Unguja island, Zanzibar, Tanzania. Dissertation. University of Dar es Salaam, 245 pp
Veron JEN (2000) Corals of the world (Volume 1). Australian Institute of Marine Science, Townsville, 463 pp
Wagner GM (1999) Coral reefs: importance, threats, conservation and restoration, In: Howell KM, Semesi AK (Eds). Coastal resources of Bagamoyo District, Tanzania. Proceedings of a Workshop on Coastal Resources of Bagamoyo, 18–19 December 1997, Bagamoyo. Faculty of Science, University of Dar es Salaam; pp 27–32
Wilkinson C (ed) (2000) Status of coral reefs of the world: 2000. Australian Institute of Marine Science, Townsville, 376 pp
Wilkinson C (ed) (2004) Status of coral reefs of the world 2004. Australian Institute of Marine Science, Townsville, Australia, 557 pp
Wilkinson C (ed) (2008) Status of coral reefs of the world 2008. Global Coral Reef Monitoring Network and Reef and Rainforest Research Centre, Townsville
Winter A, Appeldoorn RS, Bruckner A, Williams EH Jr, Goenaga L (1998) Sea surface temperatures and coral reef bleaching off La Parguera. Poerto Rica (northern Caribbean Sea). Coral Reefs 17:377–382
Wood EM (1983) Reef corals of the world: Biology and field guide. T.F.H Publications, New Jersey, 256 pp
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Ussi, A.M., Mohammed, M., Muhando, C.A., Yahya, S.A.S. (2019). Ecological Impact of Thermal Stress in Reefs of Zanzibar Following the 2016 Elevated Higher Sea Surface Temperatures. In: Yanda, P., Bryceson, I., Mwevura, H., Mung'ong'o, C. (eds) Climate Change and Coastal Resources in Tanzania. Springer Climate. Springer, Cham. https://doi.org/10.1007/978-3-030-04897-6_6
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